Isidor Kaufmann ( 1853 - 1921 ) was a painter. Isidor Kaufmann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1887.47 USD for THOSE FUNNY LITTLE ADS in 2004 to 497600 USD for PORTRAIT OF A BOY in 2006 , based on the size and medium of the artwork.